\begin{tabular}{|l|r||r|r|r|r|r|}
\hline
Serial       & Diameter   & \multicolumn{5}{c|}{Percentiles of age} \\
Correlation  & (cm)       & 5th & 25th & 50th & 75th & 95th \\
\hline
0.0 & 6.0 & 10.7  & 15.4  & 19.5  & 23.5  & 30.2 \\
0.4 & 6.0 & 9.4  & 15.4  & 20.8  & 26.2  & 36.9 \\
\hline
\end{tabular}
